package main

import (
	"fmt"
	"net/http"
	"net/url"
	"strings"

	"github.com/go-chi/chi/v5"
)

func manageClient(w http.ResponseWriter, req *http.Request) {
	ctx := req.Context()
	db := dbFromContext(ctx)
	tpl := templateFromContext(ctx)

	loginToken := loginTokenFromContext(ctx)
	if loginToken == nil {
		http.Redirect(w, req, "/login", http.StatusFound)
		return
	}

	me, err := db.FetchUser(ctx, loginToken.User)
	if err != nil {
		httpError(w, err)
		return
	} else if !me.Admin {
		http.Error(w, "Access denied", http.StatusForbidden)
		return
	}

	client := &Client{Owner: loginToken.User}
	if idStr := chi.URLParam(req, "id"); idStr != "" {
		id, err := ParseID[*Client](idStr)
		if err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}

		client, err = db.FetchClient(ctx, id)
		if err != nil {
			httpError(w, err)
			return
		}
	}

	if req.Method != http.MethodPost {
		data := struct {
			Client *Client
		}{
			Client: client,
		}
		if err := tpl.ExecuteTemplate(w, "manage-client.html", &data); err != nil {
			panic(err)
		}
		return
	}

	_ = req.ParseForm()
	if _, ok := req.PostForm["delete"]; ok {
		if err := db.DeleteClient(ctx, client.ID); err != nil {
			httpError(w, err)
			return
		}
		http.Redirect(w, req, "/", http.StatusFound)
		return
	}

	client.ClientName = req.PostFormValue("client_name")
	client.ClientURI = req.PostFormValue("client_uri")
	client.RedirectURIs = req.PostFormValue("redirect_uris")
	isPublic := req.PostFormValue("client_type") == "public"

	for _, s := range strings.Split(client.RedirectURIs, "\n") {
		if s == "" {
			continue
		}
		u, err := url.Parse(s)
		if err != nil {
			// TODO: nicer error message
			http.Error(w, fmt.Sprintf("Invalid redirect URI %q: %v", s, err), http.StatusBadRequest)
			return
		}
		switch u.Scheme {
		case "https":
			// ok
		case "http":
			if u.Host != "localhost" {
				http.Error(w, "Only http://localhost is allowed for insecure HTTP URIs", http.StatusBadRequest)
				return
			}
		default:
			if !strings.Contains(u.Scheme, ".") {
				http.Error(w, "Only private-use URIs referring to domain names are allowed", http.StatusBadRequest)
				return
			}
		}
	}

	var clientSecret string
	if client.ID == 0 {
		clientSecret, err = client.Generate(isPublic)
		if err != nil {
			httpError(w, err)
			return
		}
	}

	if err := db.StoreClient(ctx, client); err != nil {
		httpError(w, err)
		return
	}

	if clientSecret == "" {
		http.Redirect(w, req, "/", http.StatusFound)
		return
	}

	data := struct {
		ClientID     string
		ClientSecret string
	}{
		ClientID:     client.ClientID,
		ClientSecret: clientSecret,
	}
	if err := tpl.ExecuteTemplate(w, "client-secret.html", &data); err != nil {
		panic(err)
	}
}

func revokeClient(w http.ResponseWriter, req *http.Request) {
	ctx := req.Context()
	db := dbFromContext(ctx)

	id, err := ParseID[*Client](chi.URLParam(req, "id"))
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	loginToken := loginTokenFromContext(ctx)
	if loginToken == nil {
		http.Redirect(w, req, "/login", http.StatusFound)
		return
	}

	if err := db.RevokeAccessTokens(ctx, id, loginToken.User); err != nil {
		httpError(w, err)
		return
	}

	http.Redirect(w, req, "/", http.StatusFound)
}

package main

import (
	"context"
	"database/sql"
	_ "embed"
	"fmt"
	"time"

	"github.com/mattn/go-sqlite3"
)

//go:embed schema.sql
var schema string

var errNoDBRows = sql.ErrNoRows

type DB struct {
	db *sql.DB
}

func openDB(filename string) (*DB, error) {
	sqlDB, err := sql.Open("sqlite3", filename)
	if err != nil {
		return nil, err
	}

	db := &DB{sqlDB}
	if err := db.init(context.TODO()); err != nil {
		db.Close()
		return nil, err
	}

	return db, nil
}

func (db *DB) init(ctx context.Context) error {
	var n int
	if err := db.db.QueryRowContext(ctx, "SELECT COUNT(*) FROM sqlite_schema").Scan(&n); err != nil {
		return err
	} else if n != 0 {
		return nil
	}

	if _, err := db.db.ExecContext(ctx, schema); err != nil {
		return err
	}

	// TODO: drop this
	defaultUser := User{Username: "root"}
	if err := defaultUser.SetPassword("root"); err != nil {
		return err
	}
	return db.StoreUser(ctx, &defaultUser)
}

func (db *DB) Close() error {
	return db.db.Close()
}

func (db *DB) FetchUser(ctx context.Context, id ID[*User]) (*User, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM User WHERE id = ?", id)
	if err != nil {
		return nil, err
	}
	var user User
	err = scanRow(&user, rows)
	return &user, err
}

func (db *DB) FetchUserByUsername(ctx context.Context, username string) (*User, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM User WHERE username = ?", username)
	if err != nil {
		return nil, err
	}
	var user User
	err = scanRow(&user, rows)
	return &user, err
}

func (db *DB) StoreUser(ctx context.Context, user *User) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO User(id, username, password_hash)
		VALUES (:id, :username, :password_hash)
		ON CONFLICT(id) DO UPDATE SET
			username = :username,
			password_hash = :password_hash
		RETURNING id
	`, entityArgs(user)...).Scan(&user.ID)
}

func (db *DB) ListUsers(ctx context.Context) ([]User, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM User")
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var l []User
	for rows.Next() {
		var user User
		if err := scan(&user, rows); err != nil {
			return nil, err
		}
		l = append(l, user)
	}

	return l, rows.Close()
}

func (db *DB) FetchClient(ctx context.Context, id ID[*Client]) (*Client, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM Client WHERE id = ?", id)
	if err != nil {
		return nil, err
	}
	var client Client
	err = scanRow(&client, rows)
	return &client, err
}

func (db *DB) FetchClientByClientID(ctx context.Context, clientID string) (*Client, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM Client WHERE client_id = ?", clientID)
	if err != nil {
		return nil, err
	}
	var client Client
	err = scanRow(&client, rows)
	return &client, err
}

func (db *DB) StoreClient(ctx context.Context, client *Client) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO Client(id, client_id, client_secret_hash, owner,
			redirect_uris, client_name, client_uri)
		VALUES (:id, :client_id, :client_secret_hash, :owner,
			:redirect_uris, :client_name, :client_uri)
		ON CONFLICT(id) DO UPDATE SET
			client_id = :client_id,
			client_secret_hash = :client_secret_hash,
			owner = :owner,
			redirect_uris = :redirect_uris,
			client_name = :client_name,
			client_uri = :client_uri
		RETURNING id
	`, entityArgs(client)...).Scan(&client.ID)
}

func (db *DB) ListClients(ctx context.Context, owner ID[*User]) ([]Client, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM Client WHERE owner IS ?", owner)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var l []Client
	for rows.Next() {
		var client Client
		if err := scan(&client, rows); err != nil {
			return nil, err
		}
		l = append(l, client)
	}

	return l, rows.Close()
}

func (db *DB) ListAuthorizedClients(ctx context.Context, user ID[*User]) ([]AuthorizedClient, error) {
	rows, err := db.db.QueryContext(ctx, `

		SELECT client_id, client_name, client_uri, token.expires_at

		SELECT id, client_id, client_name, client_uri, token.expires_at

		FROM Client,
		(
			SELECT client, MAX(expires_at) as expires_at
			FROM AccessToken
			WHERE user = ?
			GROUP BY client
		) AS token
		WHERE Client.id = token.client
	`, user)
	if err != nil {
		return nil, err
	}

	var l []AuthorizedClient
	for rows.Next() {
		var authClient AuthorizedClient
		columns := authClient.Client.columns()
		var expiresAt string

		err := rows.Scan(columns["client_id"], columns["client_name"], columns["client_uri"], &expiresAt)

		err := rows.Scan(columns["id"], columns["client_id"], columns["client_name"], columns["client_uri"], &expiresAt)

		if err != nil {
			return nil, err
		}
		authClient.ExpiresAt, err = time.Parse(sqlite3.SQLiteTimestampFormats[0], expiresAt)
		if err != nil {
			return nil, err
		}
		l = append(l, authClient)
	}

	return l, rows.Close()
}

func (db *DB) DeleteClient(ctx context.Context, id ID[*Client]) error {
	_, err := db.db.ExecContext(ctx, "DELETE FROM Client WHERE id = ?", id)
	return err
}

func (db *DB) FetchAccessToken(ctx context.Context, id ID[*AccessToken]) (*AccessToken, error) {
	rows, err := db.db.QueryContext(ctx, "SELECT * FROM AccessToken WHERE id = ?", id)
	if err != nil {
		return nil, err
	}
	var token AccessToken
	err = scanRow(&token, rows)
	return &token, err
}

func (db *DB) CreateAccessToken(ctx context.Context, token *AccessToken) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO AccessToken(hash, user, client, scope, issued_at, expires_at)
		VALUES (:hash, :user, :client, :scope, :issued_at, :expires_at)
		RETURNING id
	`, entityArgs(token)...).Scan(&token.ID)

}

func (db *DB) RevokeAccessTokens(ctx context.Context, clientID ID[*Client], userID ID[*User]) error {
	_, err := db.db.ExecContext(ctx, `
		DELETE FROM AccessToken
		WHERE client = ? AND user = ?
	`, clientID, userID)
	return err

}

func (db *DB) CreateAuthCode(ctx context.Context, code *AuthCode) error {
	return db.db.QueryRowContext(ctx, `
		INSERT INTO AuthCode(hash, created_at, user, client, scope)
		VALUES (:hash, :created_at, :user, :client, :scope)
		RETURNING id
	`, entityArgs(code)...).Scan(&code.ID)
}

func (db *DB) PopAuthCode(ctx context.Context, id ID[*AuthCode]) (*AuthCode, error) {
	rows, err := db.db.QueryContext(ctx, `
		DELETE FROM AuthCode
		WHERE id = ?
		RETURNING *
	`, id)
	if err != nil {
		return nil, err
	}
	var authCode AuthCode
	err = scanRow(&authCode, rows)
	return &authCode, err
}

func (db *DB) Maintain(ctx context.Context) error {
	_, err := db.db.ExecContext(ctx, `
		DELETE FROM AccessToken
		WHERE timediff('now', expires_at) > 0
	`)
	if err != nil {
		return err
	}

	_, err = db.db.ExecContext(ctx, `
		DELETE FROM AuthCode
		WHERE timediff(?, created_at) > 0
	`, time.Now().Add(-authCodeExpiration))
	if err != nil {
		return err
	}

	return nil
}

func scan(e entity, rows *sql.Rows) error {
	columns := e.columns()

	keys, err := rows.Columns()
	if err != nil {
		panic(err)
	}
	out := make([]interface{}, len(keys))
	for i, k := range keys {
		v, ok := columns[k]
		if !ok {
			panic(fmt.Errorf("unknown column %q", k))
		}
		out[i] = v
	}

	return rows.Scan(out...)
}

func scanRow(e entity, rows *sql.Rows) error {
	if !rows.Next() {
		return sql.ErrNoRows
	}
	if err := scan(e, rows); err != nil {
		return err
	}
	return rows.Close()
}

func entityArgs(e entity) []interface{} {
	columns := e.columns()

	l := make([]interface{}, 0, len(columns))
	for k, v := range columns {
		l = append(l, sql.Named(k, v))
	}

	return l
}

package main

import (
	"context"
	"embed"
	"flag"
	"html/template"
	"log"
	"net"
	"net/http"
	"time"

	"github.com/go-chi/chi/v5"
)

var (
	//go:embed template
	templateFS embed.FS
	//go:embed static
	staticFS embed.FS
)

func main() {
	var configFilename, listenAddr string
	flag.StringVar(&configFilename, "config", "/etc/sinwon/config", "Configuration filename")
	flag.StringVar(&listenAddr, "listen", "", "HTTP listen address")
	flag.Parse()

	cfg, err := loadConfig(configFilename)
	if err != nil {
		log.Fatalf("Failed to load config file: %v", err)
	}

	if listenAddr == "" {
		listenAddr = cfg.Listen
	}
	if listenAddr == "" {
		log.Fatalf("Missing listen configuration")
	}
	if cfg.Database == "" {
		log.Fatalf("Missing database configuration")
	}

	db, err := openDB(cfg.Database)
	if err != nil {
		log.Fatalf("Failed to open DB: %v", err)
	}

	tpl := template.Must(template.ParseFS(templateFS, "template/*.html"))

	mux := chi.NewRouter()
	mux.Handle("/static/*", http.FileServer(http.FS(staticFS)))
	mux.Get("/", index)
	mux.HandleFunc("/login", login)
	mux.Post("/logout", logout)
	mux.HandleFunc("/client/new", manageClient)
	mux.HandleFunc("/client/{id}", manageClient)

	mux.Post("/client/{id}/revoke", revokeClient)

	mux.HandleFunc("/user/new", manageUser)
	mux.HandleFunc("/user/{id}", manageUser)
	mux.Get("/.well-known/oauth-authorization-server", getOAuthServerMetadata)
	mux.HandleFunc("/authorize", authorize)
	mux.Post("/token", exchangeToken)
	mux.Post("/introspect", introspectToken)

	go maintainDBLoop(db)

	server := http.Server{
		Addr:    listenAddr,
		Handler: loginTokenMiddleware(mux),
		BaseContext: func(net.Listener) context.Context {
			return newBaseContext(db, tpl)
		},
	}
	log.Printf("OAuth server listening on %v", server.Addr)
	if err := server.ListenAndServe(); err != nil {
		log.Fatalf("Failed to listen and serve: %v", err)
	}
}

func httpError(w http.ResponseWriter, err error) {
	log.Print(err)
	http.Error(w, "Internal server error", http.StatusInternalServerError)
}

func maintainDBLoop(db *DB) {
	ticker := time.NewTicker(15 * time.Minute)
	defer ticker.Stop()

	for range ticker.C {
		ctx := context.Background()
		ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
		if err := db.Maintain(ctx); err != nil {
			log.Printf("Failed to perform database maintenance: %v", err)
		}
		cancel()
	}
}

{{ template "head.html" }}

<main>

<h1>sinwon</h1>

<p>Welcome, {{ .Me.Username }}!</p>

<form method="post">
	<a href="/user/{{ .Me.ID }}"><button type="button">Settings</button></a>
	<button type="submit" formaction="/logout">Logout</button>
</form>

<h2>Authorized clients</h2>

{{ with .AuthorizedClients }}
	<table>
		<tr>
			<th>Client</th>
			<th>Authorized until</th>

			<th></th>

		</tr>
		{{ range . }}
			<tr>
				<td>
					{{ with .Client }}
						{{ if .ClientURI }}
							<a href="{{ .ClientURI }}" target="_blank">
						{{ end }}
						{{ if .ClientName }}
							{{ .ClientName }}
						{{ else }}
							<code>{{ .ClientID }}</code>
						{{ end }}
						{{ if .ClientURI }}
							</a>
						{{ end }}
					{{ end }}
				</td>
				<td>{{ .ExpiresAt }}</td>

				<td>
					<form method="post" action="/client/{{ .Client.ID }}/revoke">
						<button type="submit">Revoke</button>
					</form>
				</td>

			</tr>
		{{ end }}
	</table>
{{ else }}
	<p>No client authorized yet.</p>
{{ end }}

{{ if .Me.Admin }}
	<h2>Registered clients</h2>

	{{ with .Clients }}
		<p>
			<a href="/client/new"><button type="button">Register new client</button></a>
		</p>

		<table>
			<tr>
				<th>Client ID</th>
				<th>Name</th>
			</tr>
			{{ range . }}
				<tr>
					<td><a href="/client/{{ .ID }}"><code>{{ .ClientID }}</code></a></td>
					<td>{{ .ClientName }}</td>
				</tr>
			{{ end }}
		</table>
	{{ else }}
		<p>No client registered yet.</p>
	{{ end }}

	<h2>Users</h2>

	<p>
		<a href="/user/new"><button type="button">Create user</button></a>
	</p>

	<table>
		<tr>
			<th>Username</th>
			<th>Role</th>
		</tr>
		{{ range .Users }}
			<tr>
				<td><a href="/user/{{ .ID }}">{{ .Username }}</a></td>
				<td>
					{{ if .Admin }}
						Administrator
					{{ else }}
						Regular user
					{{ end}}
				</td>
			</tr>
		{{ end }}
	</table>
{{ end }}

</main>

{{ template "foot.html" }}